#   Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import unittest

import numpy as np
from dygraph_to_static_utils import (
    Dy2StTestBase,
    test_ast_only,
    test_phi_only,
)

import paddle


def dygraph_decorated_func(x):
    x = paddle.to_tensor(x)
    if paddle.mean(x) > 0:
        x_v = x - 1
    else:
        x_v = x + 1
    return x_v


@paddle.jit.to_static(full_graph=True, backend=None)
def jit_decorated_func(x):
    x = paddle.to_tensor(x)
    if paddle.mean(x) > 0:
        x_v = x - 1
    else:
        x_v = x + 1
    return x_v


@paddle.jit.to_static(full_graph=True, backend=None)
def decorated_call_decorated(x):
    return jit_decorated_func(x)


class DoubleDecorated:
    @classmethod
    @paddle.jit.to_static(full_graph=True, backend=None)
    def double_decorated_func1(self, x):
        return paddle.jit.to_static(dygraph_decorated_func)(x)

    @classmethod
    @paddle.jit.to_static(full_graph=True, backend=None)
    def double_decorated_func2(self, x):
        return jit_decorated_func(x)


class TestFullNameDecorator(Dy2StTestBase):
    @test_ast_only
    @test_phi_only
    def test_run_success(self):
        x = np.ones([1, 2]).astype("float32")
        answer = np.zeros([1, 2]).astype("float32")
        np.testing.assert_allclose(
            paddle.jit.to_static(dygraph_decorated_func)(x).numpy(),
            answer,
            rtol=1e-05,
        )
        np.testing.assert_allclose(
            jit_decorated_func(x).numpy(), answer, rtol=1e-05
        )
        np.testing.assert_allclose(
            decorated_call_decorated(x).numpy(), answer, rtol=1e-05
        )
        with self.assertRaises((NotImplementedError, TypeError)):
            DoubleDecorated().double_decorated_func1(x)
        with self.assertRaises((NotImplementedError, TypeError)):
            DoubleDecorated().double_decorated_func2(x)


if __name__ == '__main__':
    unittest.main()
